[Bug 623036] Re: Can't unset S_ISUID, S_ISGID once set on a directory

[Robert C. Sheets]

It seems this is not actually considered a bug, but is an intentional
change to coreutils. See debian bug #604625 for an explanation.

I was simply confused and should have RTFM'd.

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Title:
  Can't unset S_ISUID, S_ISGID once set on a directory

Status in “coreutils” package in Ubuntu:
  Invalid
Status in “coreutils” package in Debian:
  Fix Released

Bug description:
  Binary package hint: coreutils

  I have tested this on both ext2 and ext4 file systems, but no others.
  I see the following behavior:

  rcsheets at privateer:~$ mkdir coreutils-bug
  rcsheets at privateer:~$ ls -ld coreutils-bug
  drwxr-xr-x 2 rcsheets rcsheets 4096 2010-08-23 14:49 coreutils-bug
  rcsheets at privateer:~$ chmod 7755 coreutils-bug
  rcsheets at privateer:~$ ls -ld coreutils-bug
  drwsr-sr-t 2 rcsheets rcsheets 4096 2010-08-23 14:49 coreutils-bug
  rcsheets at privateer:~$ chmod 0755 coreutils-bug
  rcsheets at privateer:~$ ls -ld coreutils-bug/
  drwsr-sr-x 2 rcsheets rcsheets 4096 2010-08-23 14:49 coreutils-bug/

  I would expect the final permissions string to be drwxr-xr-x instead
  of having the setuid and setgid bits set. So it seems that while
  S_ISVTX is cleared, S_ISUID and S_ISGID cannot be cleared once they
  are set.

  My Ubuntu version is as follows:
  Description:    Ubuntu 10.04.1 LTS
  Release:        10.04

  And I am using this version of coreutils:
  coreutils:
    Installed: 7.4-2ubuntu2
    Candidate: 7.4-2ubuntu2
    Version table:
   *** 7.4-2ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
          100 /var/lib/dpkg/status

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